[w3c/uievents] "Process" key should be declared with more detail (#224)

`Process` key value is now declared as "The Process key". But this is difficult to understand without knowledge of Win32 SDK.

On Windows, when IME handles keyboard events before application (e.g., browser), it updates the native keycode value to `VK_PROCESS` which is `229`. All web browsers now expose this native virtual keycode to the web on any platforms. However, some browsers don't set `KeyboardEvent.key` to `Process` on non-Windows environment. So, the `Process` key value should be declared like: "`Process` key value indicates that the key has already been processed by IME".

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https://github.com/w3c/uievents/issues/224